I also have a brown looking stain, just saw it today. Washed rig last weekend, small amount of rain night before last. This is on awning attachment, substance in my case is waxy in texture and washed off with some dilute degreaser and water. Had to do lots of rinsing as brown stuff kept comming out from behiond bracket. I did find a dead wasp in awning arm (do they deposit wax like a honey bee?).
My first attempt at posting a picture hope it comes through. May not have anything to do with your situation but does look alike.
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08 Raptor 299
06 Dodge 3500 Cummins Lone Star
B&W Companion 5th
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